Ship handling and Interaction

Question 1

Describe step by step process for snubbing around

Answer 1

1. R.A
2. Toolbox talk
3. Check equipment
4. Minimum speed to keep steerage
5. Come to P/S of channel
6. Rudder hard to stbd and kick ahead
7. As soon as you get headway stop engines and rudder midships
8. Go astern, stbd swing will be complemented by transverse thrust
9. Once wash reachs bridgewing stop engines
10. Once bow is in centre of channel lower stbd anchor
11. Anchor acts as a pivot point and current will push the stern round
12. Continue using steps 6 to 9 to help turn vessel

This method should be used when you have any current

Question 2

Describe the process for short turn around

Answer 2

1. R.A
2. Toolbox talk
3. Check equipment
4. Minimum speed to keep steerage
5. Come to P/S of channel
6. Rudder hard to stbd and kick ahead
7. As soon as you get headway stop engines and rudder midships
8. Go astern, stbd swing will be complemented by transverse thrust
9. Once wash reachs bridgewing stop engines
10. Continue using steps 6 to 9 until ship is turned around

Question 3

Berthing STBD Side alongside

Answer 3

• Shallow angle of approach because TT is not working to my advantage

Question 4

Berthing PS alongside

Answer 4

• Broad angle of approach because TT is working to your advantage

Question 5

Unberthing PSTQ

Answer 5

• Hold fwd springs
• Rudder to port kick ahead, to bring stern out
• Consider additional fendering on bow
• Rudder midships, kick astern to bring bow clear

Question 6

Unberthing SSTQ

Answer 6

• Additional fendering on stbd bow
• Hold fwd springs
• Come to a broad angle to minimise contact with bow and quay

Question 7

What is Bank effect?

Answer 7

• low pressure created between the stern of a vessel and a bank will draw the stern towards the bank.

Question 8

What is bank cushioning?

Answer 8

• High pressure between the bow and bank will push the bow away from the bank

Question 9

What is squat?

Answer 9

• Low pressure between the keel and seabed reduces the a ships ukc

Question 10

How can you reduce the effect of interaction, bank effect / cushioning and squat?

Answer 10

SLOW DOWN

Question 11

Your actions when in a head on situation in a narrow channel?

Answer 11

• Slow down
• A/C stbd, to pass vessel
• A/C stbd, to counteract bank cushioning
• A/C stbd, to avoid suction
• A/C port, to avoid stern suction

Question 12

Your actions when in a overtaking situation in a narrow channel?

Answer 12

• Slow down
• Sound signals as per Rule 9
• A/C stbd, counteract suction from stern and repulsion from bank cushioning
• A/C stbd, to avoid suction
• Dependent on size, Big ships go to port to avoid suction, small ships go to stbd

Question 13

On a single screw right handed propeller what effect would transverse thrust have?

Answer 13

• When going ahead, stern will cant to stbd and bow to port
• When going stern the opposite will happen, stern to port, bow to stbd

Question 14

How would you hold an anchor watch?